<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
</head>

<body>
    <p style="position: absolute; z-index: 1;">
        <input type="checkbox" id="btn" checked />横纵比为1
    </p>

    <div id="myDiv" style="
                width: -webkit-fill-available;
                height: -webkit-fill-available;
                position: absolute;
            ">
        <div style="padding: 3%;">
            <h1>Please use [ctrl + v]</h1>
            <textarea name="" id="" cols="30" rows="10">[0] {x=0 y=0 } Vector2
[0] {x=0 y=1 } Vector2

[0] {x=0 y=2 } Vector2
[0] {x=3 y=2 } Vector2
</textarea>
            </br>
            多条折线以一行无效点隔开（可以是空行，非数字字符）
            <a href="help.html" target="blank">使用方法</a>
        </div>
    </div>
    <script src="js/main.js"></script>
</body>

</html>